Synthesis, characterization and X-ray crystal structure of potentially N6O2 coordinating macroacyclic Schiff base ligands and their Mn(II), Zn(II) and Cd(II) complexes; cytotoxic, antibacterial properties and competitive Li-7 NMR studies

Abstract

In this work, two new symmetrical, potentially N6O2 coordinating, macroacyclic Schiff base ligands (H2L1 and H2L2) were derived from the condensation of a newly synthesized polyamine, 2,2′-(ethane-1,2-diylbis(piperazine-4,1-diyl))bis(ethan-1-amine) (A), with 2-hydroxybenzaldehyde and 2-hydroxy-3-methoxybenzaldhyde respectively. Six macroacylic Schiff base complexes were prepared by direct reaction of H2L1 or H2L2 with Mn(II), Zn(II) or Cd(II) metal ions in equimolar ratios. The products were characterized by several physicochemical measurements. As well, the crystal structure of H2L1 was confirmed by a single crystal X-ray structural analysis. Competitive 7Li NMR experiments were used to pro..